English verb conjugation
COULD DECALCIFY

Regular verb: decalcify - decalcified - decalcified

Affirmation

Simple form	V-ing form
I could decalcify you could decalcify he could decalcify we could decalcify you could decalcify they could decalcify	I could be decalcifying you could be decalcifying he could be decalcifying we could be decalcifying you could be decalcifying they could be decalcifying
Perfect	V-ing perfect
I could have decalcified you could have decalcified he could have decalcified we could have decalcified you could have decalcified they could have decalcified	I could have been decalcifying you could have been decalcifying he could have been decalcifying we could have been decalcifying you could have been decalcifying they could have been decalcifying

Negation

Simple form	V-ing form
I couldn't decalcify you couldn't decalcify he couldn't decalcify we couldn't decalcify you couldn't decalcify they couldn't decalcify	I couldn't be decalcifying you couldn't be decalcifying he couldn't be decalcifying we couldn't be decalcifying you couldn't be decalcifying they couldn't be decalcifying
Perfect	V-ing perfect
I couldn't have decalcified you couldn't have decalcified he couldn't have decalcified we couldn't have decalcified you couldn't have decalcified they couldn't have decalcified	I couldn't have been decalcifying you couldn't have been decalcifying he couldn't have been decalcifying we couldn't have been decalcifying you couldn't have been decalcifying they couldn't have been decalcifying

Interrogative form

Simple form	V-ing form
could I decalcify? could you decalcify? could he decalcify? could we decalcify? could you decalcify? could they decalcify?	could I be decalcifying? could you be decalcifying? could he be decalcifying? could we be decalcifying? could you be decalcifying? could they be decalcifying?
Perfect	V-ing perfect
could I have decalcified? could you have decalcified? could he have decalcified? could we have decalcified? could you have decalcified? could they have decalcified?	could I have been decalcifying? could you have been decalcifying? could he have been decalcifying? could we have been decalcifying? could you have been decalcifying? could they have been decalcifying?

Interro-negative form

Simple form	V-ing form
couldn't I decalcify? couldn't you decalcify? couldn't he decalcify? couldn't we decalcify? couldn't you decalcify? couldn't they decalcify?	couldn't I be decalcifying? couldn't you be decalcifying? couldn't he be decalcifying? couldn't we be decalcifying? couldn't you be decalcifying? couldn't they be decalcifying?
Perfect	V-ing perfect
couldn't I have decalcified? couldn't you have decalcified? couldn't he have decalcified? couldn't we have decalcified? couldn't you have decalcified? couldn't they have decalcified?	couldn't I have been decalcifying? couldn't you have been decalcifying? couldn't he have been decalcifying? couldn't we have been decalcifying? couldn't you have been decalcifying? couldn't they have been decalcifying?